Here's what we still don't know:

  • What prompted the complaint: While The Washington Post reported that an official in was so bothered by a "promise" Trump made to a foreign leader that the official filed a formal whistleblower complaint, CNN has not independently confirmed the detail about a "promise" made to the foreign leader.
  • Who is the foreign leader: The source who spoke to CNN would not disclose the foreign leader with whom Trump was alleged to have spoken.
  • How officials are reacting: The Office of the Director of National Intelligence declined to comment. The White House has not responded to CNN's request for comment.